Cleanable multiple filter



Nov. 2, 1943. w. wiDMANN 2,333,609

CLEANABLE MULTIPLE FILTER Filed Dec. 21, 1942 Iq She'ecs-Shee'rI l M fa \m E H- m f W y .3 Z ,1 M IZTWW ..m J/ l, f 5 6 o i a J J J @am E I, l rx n0 j .l m J/ 3 J INVENTOR.

BYZ//ZZZMMN gf w NV- 2 1943 w. wlDMANN CLEANABLE MULTIPLE FILTER 3 Sheets-Sheet 2 Filed Dec. 21, 1942 r1" @mi l l 65 3 i INVENTOR BY www Nov. 2, 1943. w. WIDMANN 2,333,609

CLEANABLE MULTIPLE FILTER Filed Deo. 21, i942 5 sheets-sheets /ll i JEJE. r

Patented Nov. 2, 1943.

2,333,609 y CLEANABLE MULTIPLE FILTER Wim Widmann, neu-oit, Mich., assignor to Ralph L. SkinnerDctroit, Mich.

Application December 21, 1942, Serial No. 469,609

4 Claims. (Cl. 210-168) The current invention involves structural and operating features of noveltyv and advantage in filters and it concerns more particularly improvements in the means for cleaning the filter-elements or iilter-packs of multiple-filters, such as a pair, of which each lter is alternately operative while the other is being renovated or rehabilitated.

Among the aims and objects of the invention may be mentioned the provision of a constructionof the specified type which is relatively simplev in structure, which can be made at com-- paratilvely small cost, which is easily operated, which functions emciently, and which is unlikely to become damaged or injured or unexpectedly fail in service during ordinary use,

To enable those acquainted with this art to understand the invention fully, both from structural and functional standpoints, a present preferred embodiment thereof has been illustrated in the accompanying drawings, forming a part of this specication, and to which reference should be had in connection with the following detailed description, like reference characters, for simplicity, having been used throughout the several views of the drawings to designate like parts of the construction.

In these drawings:

Figure 1 is an elevation of the new and improved multiple-filter;

mentary lters II and I2 supported side-by-side by appropriate brackets or comparable means I3, I3, each such filter being of known structure including a vsheet-metal or other suitable housing I4 with a downwardly-converging bottom-wall I5 provided at its lowest point with a drain-port Figure 2 is a fragmentary, horizontal section on line 2 2 of Figurel;

Figure 3 is a partial, vertical section approximately on lines 3 3 of Figures 2 and 4;

Figure 4 is a horizontal, section along the axis of the main-valve on line 4 4 of Figure 3;

Figure 5 is a vertical section through the axis of such valve on lines 5 5 of Figures 2 and 4;

Figure 6 is a fragmentary, vertical cross-section through the outlet portion of the main-valve Figures 11 and 12 show in section a modiiied form` of main-valve.

It will be noted in the drawings that the new construction involves two companion or complenormally closedby a removable drain-plug I6 (Figure 1).

'Ihe top of each such housing is covered with its apertured division or partition plate II (Figure 3) on which is mounted, and depending from which is, a plurality of edge-acting filter-packs I8, one in register with each of the apertures I9, each such pack consisting of a large number of annular, impregnated, paper-discs or their equivalents, with their central' apertures in register with one another providing a longitudinal internal-passage 2| for each pack.

'I'he lower end of 'each such stack is covered and closed by a metal-disc 22 to which is attached the lower end of a coiled, contractile spring 23 occupying the internal-channel 2| of the pack and extending up through the corresponding aperture I9 of the division-plate I1 where it is connected to a short cross-rod or pin 24 bearing, at its ends on the top surface of thev plate.

-As will be readily understood, each such spring holds the discs of its pack pressed together faceto-face so that the ltering operation occurs through the shallow spaces between the impregnated discs rather than through the material of which they are composed.

Above such plate I I is a single, hollow casting having two inlet-ports 29 and |29 therethrough in communication with complementary admission-ports 3| and |3| through plate Il leading Vinto the two lter-housings I2 and II respectively outside of the several filter-packs therein, such member 25 also having two spaces or chambers 32 and |32 in communication with the internal lter-pa'ck passages or conduits 2|, 2| of the two lters II and I2 (Figure 6), such chambers having upper discharge-ports 33 and |33.

Mounted on the casting 25 by screwsV or nuts on screw-studs 36, with suitable gaskets 34, '34 between them, is a main-valve casing casting 35 having a central, horizontal, tapered valve-seat 31 with opposed inlet-ports 38 and |38 (Figures 3 and 4) connecting with the ports 29'and |29 and with opposite discharge-ports 39 and |39 connecting with ports 33 and |88 (Figures 6 and 8).

The tapered main-valve 4|, oscillatory in such valve-seat 31 by means of its accessible handle 42 (Figures 1 and 5) demountably held on the squared-end 43 of the valve, has an inlet-chamber 44 (Figures 3, 4 and 5) with two ports 45 and 48 at 90 to one another, the former port being adapted for register with the port 38, as presented in Figure 3, when port 46 is in register with the casing-port 4`| connected to admissionpipe 48, and when the valve is rocked to another position, as illustrated in Figure '1, when port 45 is at port 41, port 46 connects with port |38.

Further along its length valve 4| has an outlet or discharge chamber 49 (Figures 3, 4 and 6) having two 90 ports 5I and 52 designed to cooperate with port 39 and port 53 connected to discharge-pipe 54 in one position of the valve and to coaot with ports 53 and |39 in another angular position of the valve.

In addition, valve 4| has two longitudinal passages 55 and 56 as shown, the former having lateral inlet and outlet ports or branches 51 and 58 (Figure-1), respectively, designed at times to connect with the topmost parts of the main inlet and outlet ports |38 and |39, whereas passage 56 has analogous side inlet andoutlet ports 59 and 6| (Figure 5) arranged to coact in similar manner with admission and discharge ports 38 and 39 respectively.

As is illustrated in Figures 4 and 5, the two lengthwise passages y55 and 56 connect at one end only with a chamber 62 an opening into which is normally closed by a screw-threaded plug 63 carrying an adjustable screw 64 bearing vagainst the adjacent end of the main-valve to determine its tightness of fit in the valve-seat 31, the protruding -end portion of such screw desirably being concealed by a demountable screwthreaded cap 65.

An air-vent or upstanding overow pipe 66 (Figure connects with such chamber 62, the pipe being equipped with a manually-operated shut-oir valve 61.

At its opposite end a reduced-diameter section of the oscillatory valve 4| extends out of its surrounding casting through an appropriate stufiing-box 68 (Figures 4 and 5), and, adjacent thereto, such casting is supplied with a pair of stop-pins |59 and 1I (Figure 4) with which an external radially-projecting pin 12 (Figure 5) on the valve coacts to limit, the degree of turning of the valve by its handle 42.

As is indicated in Figure l, the outlet-pipe 54 has a lateral pipe-connection 13, equipped with a hand-operated valve 14, with the interior of chamber or space 32, and another lateral pipeconnection 15, supplied with a manual-valve 16, with the interior of chamber |32,

The operation of the described duplex or double filter is substantially as follows, one filter only being in action at a time:

Assuming that valve 4I is in the position illustrated in Figures 3 and 6, and that filter I2 is in operation, the procedure is as follows:

The contaminated fluid, such as impure oil, enters the system under suitable pressure through the inlet-pipe 48 (Figures 2, 3 and 5) and flows through passages orports 41, 46, 44, 45, 38, 29 and 3| into the housing of lter |2 where it flows inwardly through the several filter-packs I8 between their discs leaving itsfseparated iinpurities in part adhered to the exteriors of lthe filter-packs and probably in part deposited the lower section I5 of the housing. It then passes upwardly in the lter-pack passages 2|, through apertures I9 into compartment 5 ..32 from which (Figure 6)' it iiows up through ports and passages 33, 39, 5I49, 52 and 53 into the outlet or discharge-pipe 54 from which it is delivered as purified oil, the two valves 14 and 16 being closed during such procedure.

When, however, it is desired to clean and rell the then inactive filter II, it i accomplished in this manner without interrupting the operation of the lter I2.

Drain-plug I6 is removed from lter II and the impure, unltered oil in its housing outside of the lter-packs drains away carrying with it any separated impurities accumulated in the lower portion of the housing and any washed from the surface of the packs by the discharging oil.

This drainage, at least in some cases, may be facilitated by opening valve 61 to allow air to enter the housing above such oil through passage 55 and its side ports 51 and 58, as shown in Figure 4. v

In order to more thoroughly clean the external surfaces of the several filter-packs I8 of such lter |I by forcing clean oil through them reversely, the following procedure is resorted to.

Valve 4| is turned clockwise just enough to bring ports 51 and 58 out of communication` with ports |38 and |39, thereby only closing ports as shown in small degree in Figure 9, whereupon valve 16 (Figure l) is opened, thus allowing puried or clean filtered oil to pass from pipe 54, by reason of' its pressure therein, through valve 16 and pipe 15, into chamber |32 from which it flows through apertures I9 into the interiors of all of the filter-packs, then outwardly between their` discs into housing I4 from which it discharges through the now-open drain at the bottom of the housing.

The above-specified flow of the clean oil constitutes a reverse or counter ow through all of the filter-packs which cleans their outer surfaces from adhering matter and this also is delivered through the open drain.

Thus the filter is eiciently and easily cleaned and renovated and this having been accomplished, the drain-plug is put back in place closing the drain and valve 4I is turned slightly to cause port 51 to register with the extreme top part of port |38 and to cause port 58 to register with the upper part of port |39, as shown in Figures 3 and 6, whereupon the entering purified oil fills the entire housing I4 of lter II both inside and outside of the filter-packs, this oil also gradually filling the numerous passages fand ports I3I, |29, |38, 51, |32, |33, |39, 58, 55, chamber 62, pipe 66 Aand valve 61, such oil in thus iilling the filter forcing out any air therein before it through the open vent-valve 61, and,

when such oil begins to overflow from pipe 66,

valves 61 and 16 are closed, and at any time thereafter, when lter I2 requires like cleaning,

filter II is ready to be placed in service by turning valve 4| into the position shown in Figure 7, filter I2 then being out of operation.

To start the cleaning of lter I2, after filter 70 II has been thus rendered operative, its drainplug I6 is removed, and much of the oil is allowed to drain out while valve 61 is open to facilitate such action.

Then valve 4|V is Iturned to the position presented in Figure l0 and valve 14 is opened to Y This having been completed, valve 4| is again turned to the position presented in Figure '1 and valve 61 is opened, and as soon as oil overows through pipe 66, valve 61 is closed thus completing the cleaning operation of lter l2.

It will be understood that the valve 4| is turned to the two positions shown in Figures 9 and 10, during the reverse or back flow of puried oil through the lter-packs, to close the otherwise by-passes around the filter-packs which, if allowed to remain open, might at least in some cases preclude the accomplishment of the reverse ow of liquid through the filterpacks.

Hereinafter, .the two passages 38-29-3I and |38-|29 |3I will be designated as the filterinlets, the passages 39-33 and |39|33 as the filter-outlets, the valve conduits 46-44-45 and derstand that this invention is not necessarily For instance, instead of using two passages 55 and 56, a single properly-connected passage |55 may be employed with all four ports |51, |58, |59

and |6| (corresponding to ports 51, 5B, 59 andl 6|) connected thereto as shown in Figures 11 and 12.

Iclaim:

1. In a multiple lter construction, the novel combination of rst and second complementary filters, each having a housing, a filter-inlet, a filter-outlet, an openable and closable drain, and

' a filter-medium in said housing between said inlet and said outlet throughwhich the iiuid undergoing ltration passes, an inlet-conduit, a discharge-conduit, a mainvalve having an inletpassage and an outlet-passage, said main-valve inlet-passage in one position of said valve connecting said inlet-conduit with the lter-inlet of said first filter and said discharge-conduit with Athe filter-outlet of the same lter, said valve inlet-passage in a second position of said Valve connecting said inlet-conduit with the filter-inlet of said second filter and said discharge-conduit with the filter-outlet of said second filter, a first duct connecting said discharge-conduit with the interior of said first filter on the outlet side of its filter-medium, a first-valve in said rst duct,

a second duct connecting said discharge-conduitwith the interior of said second-lter on the outlet side of its filter-medium, and a second valve in said second duct, whereby when either lter is operated with the other ilter inoperative, the drain of the inoperative filter may be opened and the valve in the duct of such inoperative lter may be opened to clean the lter-medium of such inoperative ilter by forcing filtered uid reversely therethrough.

2. The novel combination of features in a multiple-lter construction set forth in claim 1, in which said main-valve has vent-means connecting with the filter-inlet and the filter-outlet of either filter only when such filter is inoperative, and a control valve-means in said vent-means.

3. The novel combination of features in a multiple-filter construction set forth in claim 1, in which the top portion of said filter-inlets and filter-outlets are the highest parts of the connections with their filters, and in which said main-valve has vent-means connecting with the filter-inlet and the filter-outlet of either lter only when such filter is inoperative, and a control valve-means in said vent-means.

4. The novel combination of features in a multiple-lterconstruction set forth in claim 1, inV

WILLI wmMANN. 

